KR100266533B1 - Selective call receiver - Google Patents

Abstract

The select call receiver includes a memory for storing a plurality of conversion tables each having a different character set. Each conversion table is used to convert a numeric code into a display character code for displaying visible information on the screen. The table selector selects a conversion table from among a plurality of conversion tables according to the table selection code included in the message data. The converter converts each numeric code contained in the message data following the table selection code into a display character code by using the selected character table.

Description

WIRELESS SELECTION CALL RECEIVER {SELECTIVE CALL RECEIVER}

The present invention relates generally to selective call receivers, and more particularly to selective call receivers having a message display function.

Selective call receivers have been widely used for a variety of purposes, and particularly small, lightweight selective call receivers called pagers are suitable for portable use. The primary function of the selective call receiver is to notify the user of an incoming call using beep sound, vibration, or light. In addition to some alarm functions, some select call receivers also have the ability to display numeric messages on a liquid crystal display (LCD). However, since only numbers are used to display information on the LCD, the transmitted information cannot be transmitted correctly.

In order to improve the expressive power, a selective call receiver having a conversion table for converting from a numeric code to a display character code is proposed in Japanese Unexamined Patent Publication No. 7-226969. More specifically, when detecting a 2-digit message code from the received message data, the display character code corresponding to the message code is retrieved from the conversion table. In this way, all message codes are converted into the corresponding display characters, which are used to display the received information on the LCD.

However, the prior art cannot provide enough display characters and the display expression power is limited. In a conventional receiver, since each two-digit message code is selected from ten digits: 0-9, the maximum number of display characters stored in the conversion table is limited to 100. Therefore, it is very difficult to widen the variety of display characters without reducing the transmission performance.

It is an object of the present invention to provide a selective call receiver capable of increasing the number of types of display characters.

According to the invention, the selective call receiver has a memory for storing a plurality of conversion tables each having a different character set, each conversion table converting a numeric code into a display character code for displaying visible information on the screen. It is used to The table selector selects one conversion table from among a plurality of conversion tables according to the table selection code included in the message data. The converter converts each numeric code contained in the message data following the table selection code into a display character code using the selected conversion table.

Since a plurality of conversion tables having different character sets are selectively used according to the table selection code included in the received message, the number of types of characters and symbols to be displayed increases, thereby increasing the expressive power.

The table selection code may be a first selection code that indicates the start of the conversion. The table selection code also includes a second selection code next to the first selection code, the second selection code indicating a table change from one table to the other in the order of selection. Alternatively, the table selection code may further include a second selection code at a position after the first selection code, the second selection code including a table change code following the selection code used to select the conversion table.

1 is a block diagram showing the functional structure of a first embodiment of a selective call receiver according to the present invention;

Fig. 2A is a schematic diagram showing the color of a signal received by the embodiment.

Fig. 2B is a schematic diagram illustrating a receiving operation of the embodiment.

Fig. 3A is a schematic diagram showing an example of the conversion code table T1.

Fig. 3B is a schematic diagram showing an example of the conversion code table T2.

4 is a schematic diagram illustrating an example of a specific code set stored in an EEPROM.

Fig. 5 shows an example of a received message code for explaining a specific code and a character code.

6 is a flowchart showing a first embodiment of a message display operation according to the present invention;

Fig. 7A illustrates an example of a message displayed according to the first embodiment of the message display operation according to the present invention.

Figure 7B illustrates another embodiment of a message displayed according to the first embodiment of the message display operation according to the present invention.

8A is a schematic diagram showing an example of a conversion code table T3.

8B is a schematic diagram showing an example of the conversion code table T4.

9 is a schematic diagram showing another example of a specific code set stored in an EEPROM.

Fig. 10 is a flowchart showing a second embodiment of the message display operation according to the present invention.

Fig. 11A illustrates an example of a message displayed according to the second embodiment of the message display operation according to the present invention.

Figure 11B illustrates another example of a message displayed according to the second embodiment of the message display operation according to the present invention.

<Description of the code | symbol about the principal part of drawing>

104: control unit

201: controller

202: ROM

203: memory controller

204: message memory

205: Message Converter

206: position counter

207: table counter

208: Translation Code Table Memory

210: LCD controller

211: alarm controller

In FIG. 1, the wireless system module 101 receives a wireless signal from a wireless base station (not shown) of a selective calling system via a built-in antenna. The received wireless signal is demodulated into a baseband signal that is sent from the wireless system module 101 to the decoder 102 as a select call signal.

Decoder 102 decodes the select call signal and retrieves the decoded select call signal for an identification (ID) number stored in EEPROM (electrically erasable programmable read-only memory) 103. If the selection call number included in the decoded selection call signal is the same as the ID number, the decoder 102 outputs the reception interruption to the control unit 104 and then the message data received next to the selection call number is the decoder 102. ) To the control unit 104.

The control unit 104 controls the LCD 105, the speaker 106, the LED 107, the vibration motor 108, and the intermittent reception controller 109. More specifically, the control unit 104 includes a controller 201 which executes operation programs and other function programs stored in the program ROM 202 which performs operation control of the selective call receiver.

When a reception interruption occurs, the controller 201 controls the memory controller 203 so that the received message data is stored in the message memory 204. The controller 201 checks whether the received message data includes a specific conversion code previously stored in the EEPROM 103. If a specific translation code is found, the controller 201 controls the message converter 205 with a message location counter 206 and a table counter 207. The message converter 205 sequentially converts message data following a specific conversion code into display characters and is referred to the conversion code table memory 208. The conversion code table memory 208 stores a plurality of conversion tables T ₁ -T _{N for which} conversion tables to be used are selected and used for message conversion. Table selection is determined by the counter Q of the table counter 207. From below, it is assumed that the conversion table T _Q (Q = 1, 2, ..., N) is selected by the count Q of the table counter 207.

Display data corresponding to the display characters obtained by the message converter 205 are read from the font memory 209 and sent to the LCD controller 210 where the visible characters are displayed on the LCD 105. Thereafter, the controller 201 controls the alert controller 211 so that an audible alert is generated by driving the speaker 106, and a visible alert is generated by flashing the LED 107, or vibrating. An alert is generated by driving the vibrating motor 108.

It should be noted that the control unit 104 may be implemented with a program-controlled processor such as a CPU or a DSP.

In Fig. 2A, the selection call signal is a preamble, an arrangement consisting of a subsequent synchronization code (SC), eight groups each followed by a first code word and a second code word (G # 1-G #). 8). Each code word consists of information classification bits, information bits, and check bits. If the information fractionating bits are zero, the information bits indicate a selection call number (ID) or they indicate a message.

In Fig. 2B, when the selection call number of the group G # 2 is the same as its ID number, the decoder 102 outputs a reception interruption to the controller 201. In turn, the decoder 102 sends the message data following the selection call number of the group G # 2 to the controller 201 until a different ID number is detected. In this figure, the controller 201 recognizes data ranging from the second code word of the group G # 2 to the second code of the group G # 3.

The conversion code table memory 208 stores a plurality of conversion tables T ₁ -T _N each having a different character set. For example, the following may be considered: uppercase alphanumeric character set, lowercase alphanumeric character set, special character set, and any combination thereof may be used. Also, character sets of other languages (English, German, French, Chinese, Korean, Japanese and other languages) can be used.

First embodiment

3A and 3B, examples of conversion tables in the case of two conversion tables T ₁ and T ₂ stored in conversion code table memory 208 are shown, respectively. As shown in Fig. 3A, the conversion table T ₁ stores an uppercase alphabet letter set, a numeric character set, and several symbols. As shown in Fig. 3B, the conversion table T ₂ stores three lowercase alphabetic characters, a date and time symbol, and several marks.

As shown in Fig. 4, the EEPROM 103 further stores two kinds of specific codes "-" and " 80 ". As described below, the first specific code "-" means that subsequent data is used for message conversion (hereinafter referred to as conversion code). The second specific code " 80 " means that the conversion table is changed to another table (hereinafter referred to as table change code). Details are described with reference to FIG.

As shown in Fig. 5, it is assumed that the received message starts from the conversion code "-" after the table change code "80". In this case, the table change code "80" appears after the conversion code "-", so the message converter 205 converts the conversion table from T ₁ to T ₂ and vice versa. Therefore, when the conversion table T ₁ as shown in Fig. 3A is selected, the code "29" is converted into the uppercase letter "I". On the other hand, when the conversion table T ₂ as shown in Fig. 3B is selected, the code "29" is converted to the lowercase letter "i".

Each code of the message consists of two digits, each of 4 bits. The count P of the message location counter 206 indicates the location of the two-digit code or single-digit numeric character to be read.

Referring to Fig. 6, when receiving a reception interruption from the decoder 102 (step S301), the controller 201 receives the message data received from the decoder 102 through the memory controller 203 into the message memory 204. Is transmitted (step S302). In turn, the controller 201 transmits the message data to the message converter 205 (step S303). The message converter 205 initializes the message location counter 206 and the table counter 207 so that the message location counter 206 is set to P = 1 and the table counter 207 is set to Q = 1, (T ₁ ) is initially selected (steps S304 and S305).

The message converter 205 checks in the message data whether the 2-digit data XX _p indicated by P = 1 is equal to the conversion code "-" (step S306). If XX _p = "-" (YES in step S306), the message converter 205 increments the position counter 206 by 2 (step S307), and determines whether the next two-digit data (XX _p ) is a number. It checks (step S308). If XX _p is a number (YES in step S308), the message converter 205 checks whether XX _p is _equal to the table change code "80" (step S309).

When XX _p = "80" (YES in step S309), the message converter 205 selects another conversion table by setting the table counter 207 to another value (step S310). In particular, when the table counter 207 is set to Q = 1 when XX _p = "80", the table counter 207 is converted to Q = 2. When the table counter 207 is set to Q = 2, if XX _p = " 80 &quot;, the table counter 207 is converted to Q = 1. In this way, the conversion table T _Q is selected according to the count Q of the table counter 207.

When XX _p is not equal to "80" (NO in step S309), the message converter 205 reads the character code corresponding to XX _p from the selected conversion table T _Q (step S311). In turn, the controller 201 reads the character display data corresponding to the character code from the font memory 209 and then transmits it to the LCD controller 210 (step S312).

After step S310 or S312 is completed, the message converter 205 increments the location counter 206 by two (step S313), and then checks whether the location counter 206 indicates the end of the message (step S314). If the position count P does not indicate the end of the message (NO in step S314), steps S308-S313 are performed continuously until the count P indicates the end of the message.

On the other hand, if XX _p is not equal to "-" (NO in step S306) or XX _p is not a number (NO in step S308), XX _p is normal message data. Therefore, the controller 201 reads display data corresponding to the first digit of XX _p from the font memory 209 and then transfers it to the LCD controller 210 (step S315). After that, the message converter 205 increments the position counter 206 by one and then checks whether the position counter 206 indicates the end of the message (step S317).

If the position count P indicates the end of the message (YES in step S314 or S317), the controller 201 controls the LCD controller 210 so that display data is displayed on the LCD 105 (step S318). ). The controller 201 controls the alarm controller 211 so that an alarm is generated by the alarm device selected from the speaker 106, the LED 107, and the vibration motor 108 (step S319).

As shown in Fig. 7A, an alphanumeric string &quot;-2 9 8 8 3 8 2 9 4 9 4 9 8 8 5 0 3 0 5 6 8 0 6 8 8 0 9 6 9 7 6 9 9 8 0 0 When receiving a message containing ", the numeric code" 29 "follows the conversion code"-", so the message converter 205 capitalizes the code" 29 "with reference to the initially selected conversion table T ₁ . Convert to "I". Similarly, the sequential codes "88" and "38" are converted to spaces and capital letters "M", respectively. Further, each table change code "80" is detected so that the conversion table changes between T ₁ and T ₂ . In this way, visible information as shown in FIG. 7A is displayed on the LCD 105.

As shown in Fig. 7B, a column of alphanumeric characters: such as "--9 6 9 7 8 0 8 7 8 0 9 8 0 0 8 0 3 8 1 0 1 0 4 0 2 9 3 9 2 7" When receiving a message including visible information, as in the case described above, the visible information shown in FIG. 7B is displayed on the LCD 105.

As described above, the selection code and the numeric codes are each formed of a combination of two numeric characters each selected from "0" to "9". The numeric characters "0" to "9" can be formed of only four bits, and the desired message can be transmitted without reducing the transmission performance.

Second embodiment

8A and 8B, extended conversion tables T ₃ and T ₄ when four conversion tables T ₁ -T ₄ are stored in the conversion code table memory 208 are shown, respectively. Conversion tables T ₁ and T ₂ are previously shown in FIGS. 3A and 3B.

As shown in Fig. 8A, the conversion table T ₃ stores a two-byte uppercase alphabet letter set, a two-byte numeric character set, and several two-byte symbols. As shown in Fig. 8B, the conversion table T ₄ stores a two-byte lowercase alphabet letter set, a two-byte temporary symbol, and several two-byte marks.

As shown in Fig. 9, the EEPROM 103 further stores six kinds of specific codes: "-", "80", "01", "02", "03" and "04". As described above, the first specific code "-" is a conversion code and the second specific code "80" is a table change code. Further, when the table change code "80" is followed by the third specific code "01", the third specific code "01" means that the conversion table T ₁ is selected. Similarly, each particular code "02"-"04" is followed by the table change code "80" so that the conversion tables T ₂ -T ₄ are selected.

In Fig. 10, when receiving an interruption from the decoder 102 (step S401), the controller 201 transmits the received message data from the decoder 102 to the message memory 204 via the memory controller 203. (Step S402). In turn, the controller 201 transmits the message data to the message converter 205 (step S403). The message converter 205 initializes the message location counter 206 and the table counter 207 so that the message location counter 206 is set to P = 1 and the table counter 207 is set to Q = 1, i. The table T ₁ is initially selected (steps S404 and S405).

The message converter 205 checks whether the 2-digit data XX _p indicated by P = 1 in the message data is equal to the conversion code "-" (step S406). If XX _p = "-" (YES in step S406), the message converter 205 increments the position counter 206 by 2 (step S407), and also checks whether the next two-digit data (XX _p ) is numeric. Is further examined (step S408). If XX _p is a number (YES in step S408), the message converter 205 further checks whether XX _p is _equal to the table change code "80" (step S409).

If XX _p = "80" (YES in step S409), the message converter 205 increments the position counter 206 further by 3 (step S410), and then XX _p is _equal to the selection code "02". Inspect (step S411). When XX _p = " 02 " (YES in step S411), the message converter 205 selects the conversion table T ₂ by setting the table counter 207 to Q = 2. If XX _p is not "02" and "03" (NO in step S411 and YES in step S413), the message converter 205 sets the conversion table T ₃ by setting the table counter 207 to Q = ₃ . Is selected (step S414). If XX _p is not "03" and "04" (NO in step S413 and YES in step S415), the message converter 205 sets the conversion table T ₄ by setting the table counter 207 to Q = 4. Is selected (step S416). If XX _p is not "04" (NO in step S415), the message converter 205 selects the conversion table T ₁ by setting the table counter 207 to Q = 1 (step S417).

If XX _p is not equal to "80" (step S409), the message converter 205 reads the character code corresponding to XX _p from the selected conversion table T _Q (step S418). In turn, the controller 201 reads the character display data corresponding to the character code from the font memory 209 and then transfers it to the LCD controller 210 (step S419).

After the step S412, S414, S416, S417 or s419 ends, the message converter 205 increments the location counter 206 by 2 (step S420), and then the location counter 206 ends the message. Is checked (step S421). If the position counter P does not indicate the end of the message (NO in step S421), steps S4108-S420 are repeatedly performed until the count P indicates the end of the message.

On the other hand, if XX _p is not equal to "-" (NO in step S406) or XX _p is not a number (NO in step S408), XX _p is normal message data. Therefore, the controller 201 reads display data corresponding to the first digit of XX _p from the font memory 209 and then transfers it to the LCD controller 210 (step S422). After that, the message converter 205 increments the position counter 206 by one (step S423), and then checks whether the position counter 206 indicates the end of the message (step S424).

If the position count P indicates the end of the message (YES in step S421 or S424), the controller 201 controls the LCD controller 210 so that display data is displayed on the LCD 105 (step S425). . The controller 201 controls the alarm controller 211 so that an alarm is generated by the alarm device selected from the speaker 106, the LED 107 and the vibration motor 108 (step S426).

As shown in Fig. 11A, an alphanumeric character string: " -8 0 0 3 2 9 8 8 3 8 2 9 4 9 4 9 8 8 5 0 3 0 5 6 8 0 0 4 6 8 8 0 0 1 9 6 9 7 6 9 9 8 0 0, when receiving a message containing the "0", the table converter code "80" followed by the conversion code "-" appears, so that the message converter 205 ) Selects the conversion table T ₃ used to convert the code "29" following the selection code "03" into a 2-byte uppercase letter "I". Similarly, the following codes "88" and "38" are converted to spaces and capital letters "M", respectively. Also, each table change code " 80 " followed by a selection code is detected, and a conversion table is selected from T ₁ -T ₄ depending on the selection code. In this way, visible information as shown in FIG. 11A is displayed on the LCD 105.

As shown in Fig. 11B, an alphanumeric string: " -8 0 0 3 9 6 9 7 8 0 0 4 8 7 8 0 0 3 9 8 0 0 8 0 0 1 3 8 1 0 1 0 4 0 2 When receiving a message containing 9 3 9 2 7 ", as described above, visible information is displayed on the LCD 105 as shown in Fig. 11B.

As shown in Figs. 11A and 11B, various combinations of 1-byte, 2-byte, uppercase and lowercase letters can be obtained.

Further, each of the selection code and the numeric code is formed of a combination of two numeric characters each selected from "0-9". Since the numeric characters " 0 "-" 9 " can be formed with only 4 bits, the desired message can be transmitted without reducing the transmission performance.

Claims (12)

A selective call receiver for receiving a selective call signal for carrying message data, comprising: A memory for storing a plurality of conversion tables each having a different character set and used for converting numeric codes into display character codes to display visible information; A table selector for selecting one conversion table from a plurality of conversion tables according to a table selection code included in the message data; And Table Selection Codes A converter for converting each numeric code contained in the following message data into a display character code using the selected conversion table. Selective call receiver comprising a. 2. The select call receiver of claim 1 wherein the table select code comprises a first predetermined code indicating the start of a transform. 3. The system of claim 2, wherein the table selection code further comprises a second predetermined code at a position after the first predetermined code, wherein the second predetermined code is moved from one place to another in a predetermined order. Optional call receiver, characterized by indicating conversion. 3. The table of claim 2, wherein the table selection code further comprises a second predetermined code at a position after the first predetermined code, the second predetermined code being followed by a selection code to be used to select a conversion table. A selective call receiver comprising a change code. 5. The selective call receiver according to any one of claims 2 to 4, wherein said first predetermined code consists of two alphanumeric characters. 4. The selective call receiver of claim 3, wherein the second predetermined code consists of two numeric characters. 5. The selective call receiver of claim 4, wherein each of the table change code and the selection code consists of two numeric characters. A selective call receiver for receiving a selective call signal for carrying message data, comprising: A first memory for storing a conversion start code and a table selection code; A second memory for storing a plurality of conversion tables each having a different character set and used for converting a numeric code into a display character code to display visible information on a screen; A detector for detecting from said message data said conversion start code and said table selection code located after said conversion start code; And A processor for selecting one conversion table from among a plurality of conversion tables according to the table selection code and converting each numeric code included in the message data following the table selection code into a display character code using the selected conversion table; Selective call receiver comprising a. A method for displaying on a screen a message received at a selective call receiver for receiving a selective call signal carrying message data, the method comprising: Storing a plurality of conversion tables each having a different character set and used for converting a numeric code to a display character code; Selecting one conversion table from a plurality of conversion tables according to a table selection code included in the message data; And Converting each numeric code contained in the message data following the table selection code into a display character code using the selected conversion table. Method comprising a. 10. The method of claim 9, wherein the table selection code includes a first predetermined code that indicates the start of the conversion. 11. The method of claim 10, wherein the table selection code further comprises a second predetermined code at a position after the first predetermined code, wherein the second predetermined code is table from one place to another in a predetermined order. Characterized by indicating that the change. 12. The table of claim 10, wherein the table selection code further comprises a second predetermined code at a position after the first predetermined code, the second predetermined code being followed by a selection code to be used to select a conversion table. And a change code.